PLL Synthesizer with I 2 C Bus for TV Tuner
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- Melvin Hutchinson
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1 PLL Synthesizer with I 2 C Bus for TV Tuner DESCRIPTION The NJW1504/1508 are a PLL frequency synthesizer especially designed for TV and VCR tuning systems and consists of PLL circuit and a prescaler which operates up to 1.0GHz, built into one chip. The NJW1504/1508 are controlled through an I 2 C-bus. FEATURES Operating Voltage 5V Low Operating Current : 15mA Prescaler accepts frequencies up to 1GHz on chip Reference Signal : NJW1504: Reference Signal Oscillator with peripheral of Xtal on chip NJW1508: Buffer Amplifier for External Reference Signal on chip 34V max. tuning voltage output Package Outline: SSOP16 PACKAGE OUTLINE NJW1504V/NJW1508V BLOCK DIAGRAM BS0-BS3 VCC3 VCC1 5V GND BAND SW 4bit 4bit Latch I2C Bus Receive r ADRS SDA SCL HF IN 1/8 Programmable Divider 15bit 15bit Latch CP VCC2 PreAMP 8bit Latch AMPOUT AMP Phase OUT Phase Comp. 1/1024 1/512 (1/640) Ref. Divider X tal OSC OSCOUT XTAL (Note) Purchase of I 2 C components of New Japan RadioCo.,Ltd or one of its sublicensed Associated Companies conveys a license under the Philips I 2 C Patent Rights to use these components in an I 2 C system, provided that the system conforms to the I 2 C standard specification as definedby by Philips
2 ABSOLUTE MAXIMUM RATINGS (T A =25 C) Parameter Symbol Ratings Unit Supply Voltage (Vcc1, 3) Vcc1, Vcc3-0.3 to +6.5 V Supply Voltage (Vcc2) Vcc2-0.3 to +36 V Input Voltage (except I 2 C bus) Vi -0.3 to Vcc+0.3 V Output Voltage (except I 2 C bus) Vo -0.3 to Vcc+0.3 V I 2 C bus Input Voltage Viiic -0.3 to 6.5 V Power Dissipation PD 300 mw Operating Temperature Range T opr -20 to +85 C Storage Temperature Range T stg -40 to +125 C RECOMMENDED OPERATING CONDITION (T A =25 C) Parameter Condition Symbol Min. Typ. Max. Unit Operating Voltage Vcc1, Vcc3 Vcc1, Vcc V Operating Voltage Vcc2 Vcc V X tal Operating Range fxtal MHz HF Input Frequency Input= -20dBm fhf MHz Clock Frequency f SCL KHz Bus Free Time t BUF us Data Hold Time t HDSTA us SCL Low Hold Time t LOW us SCL High Hold Time t HIGH us Set-up Time Refer to I 2 C bus Timing Chart tsusta us Data Hold Time thddat us Data Set-up Time tsudat ns Rise Time tr ns Fall Time tf ns Data Set-up Time tsusto us SDA t BUF t LOW t HIGH t SU;DAT t HD;STA SCL t HD;STA t R t HD;DAT t F t SU;STA t S U;STO I 2 C bus Timing Chart V IH min(0.7 Vcc1) and V IL max(0.3 Vcc1) - 2 -
3 ELECTRICAL CHARACTERISTICS (Vcc1,3=5V,Vcc2=34V,T A =25 C) Parameter Condition Symbol Min. Typ. Max. Unit Operating Current 1 f HF =100MHz I CC ma Operating Current 2 AMPOUT: Low Level I CC ma AMP Input Current Phase OUT: High Imp (2.5V) I IN (-50) 0.1 (50) na AMP Output Current ANP OUT: Low Level AMPOUT Input=5V I OUT ma AMP Gain f=1khz AV db Phase Comparator Output Current Current Source I sourse ua Phase Comparator Output Current Current Sink I sink ua Band Switch L Output Current BS0=BS1=0.3V I OBS0-1L ma H Output Current BS0=BS1=4.7V I OBS0-1H ma L Output Current BS2=BS3=0.3V I OBS2-3L ma H Output Current BS2=BS3=4.7V I OBS2-3H ma I 2 C bus H Input Current SCL, SDA Terminal I IN H ua L Input Current SCL, SDA Terminal I IN L ua H Input Voltage Range SCL, SDA Terminal V IH V L Input Voltage Range SCL, SDA Terminal V IL V ACK Sink Current ACK Output, SDA=0.4V V ACK ma - 3 -
4 TEST CIRCUIT 5V SDA SCL 34V VS3 5V 2mV 1kHz VS2 2.5V OSC OUT p 4MHz k HF GND VCC1 VCC3 BS3 BS2 BS1 BS0 XTAL ADRS SDA SCL OSC OUT VCC2 AMP OUT CP n 50 SG -20dBm 5V COUNTER VS1 4.7V or 0.3V - 4 -
5 I 2 C bus Protocols The input information, which consists of chip address and next two or four byte data, is received by I 2 C bus receiver. The allowable I 2 C bus protocols are as follows. (1) STA CA CB BB STO (2) STA CA D1 D2 STO (3) STA CA CB BB D1 D2 STO (4) STA CA D1 D2 CB BB STO STA: Start Condition STO: Stop Condition CA: Chip Address CB: Control Byte BB: Band switch Byte D1: Divider Byte 1 D2: Divider Byte 2 For suitable circuit operation,5-byte data should have chip address, 2-byte control data, band data, and 2-byte divider byte. Following chip address. 2-byte data is received. For distinction of each data, first and third data byte has a function bit. As function bit, divider byte has 1 and control/band data has 0. S DA SCL STA ADDRESS R/W ACK DATA ACK ACK STO - 5 -
6 Data Format Parameter Symbol MSB LSB Chip Address CA CA1 CA0 0 A Divider Byte 1 D1 0 N14 N13 N12 N11 N10 N9 N8 A Divider Byte 2 D2 N7 N6 N5 N4 N3 N2 N1 N0 A Control Byte CB 1 CP T2 T1 T0 RD1 RD0 A Band switch Byte BB BS3 BS2 BS1 BS0 A Data specifications : don t care ;0 or 1 CA1, CA0 : Programmable address bits ADRS Voltage CA1 CA0 Always valid to 0.1 Vcc Vcc1 to 0.6 Vcc Vcc1 to Vcc1 1 1 BS0 to BS3 : Band switch buffers Control bits, BSn=1 then ON N0 to N14 : Control of Programmable divider bits, N14=MSB N0=LSB Dividing ratio : N=2 14 N N N1+N0 Maximum division ratio Minimum division ratio 256 CP : Charge Pump Current CP Charge Pump Current Conditions 1 280µA Normal, Default 0 60µA Test T0 to T2 :Test mode bits T0,T1,T2 :Phase Comparator Output bits T2 T1 T0 Phase Comparator, Band Switch Conditions 0 0 Normal Output Normal, Default Phase Comparator (High Impedance) Test Phase Comparator (Sink) Test Phase Comparator (Source) Test RD1,RD0 : Reference Divider bits RD1 RD2 Reference Divider Conditions Default (Note) Default : Power on reset - 6 -
7 TERMINAL CHARACTERISTICS No. Symbol Typ.DC Voltage (V) Equivalent Circuit Function 1 HF High Frequency Signal Input 2 GND 0 3 GND 3 VCC1 5 2 Power Supply 4 VCC Band Switch Power Supply 5 6 BS3 BS2 0 5,6 Band Switch (Typ: 7.5mA) 7 8 BS1 BS0 0 7,8 Band Switch (Typ: 15mA) 9 CP - 9 Charge Pump Output - 7 -
8 No. Symbol Typ.DC Voltage (V) Equivalent Circuit Function 10 AMPOUT Amplifier Output 11 VCC2 34 Amplifier Power Supply 12 OSCOUT Reference Oscillator Output 13 SCL - 13 SCL Input (I 2 C bus) 14 SDA - 14 SCL Input (I 2 C bus) 15 ADRS - 15 ADRS Input (I 2 C bus) 16 XTAL 3.3 Crystal Input
9 TYPICAL CHARACTERISTICS T A =25 C 40.0 VCC1 Supply Current Curve 0 XTAL Input Sensitivity Curve NJW1508 XTAL:50ome/0.1uF 35.0 Supply Current [ma] Input Level [dbm] VCC1 Supply Voltage [V] Input Frequency [MHz] 50.0 BS0-BS1 Output Current Curve VCC1=VCC3=5.0V 25.0 BS3 Output Current Curve VCC1=VCC3=5.0V Output Current [ma] Output Current [ma] Output Voltage [V] Output Voltage [V] - 9 -
10 MEMO [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.
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